Coasts

Question 1

Why does deposition take place?

Answer 1

When the sea loses energy, it drops the material it has been carrying.

Question 2

What type of beach forms in a bay?

Answer 2

Sand beach

Question 3

What type of beach forms in a high energy coastline?

Answer 3

Shingle

Question 4

Why might a wave be sheltered from the wind?

Answer 4

A wave goes into a bay

Question 5

Name one type of physical (mechanical) weathering?

Answer 5

Freeze-Thaw

Question 6

Longshore drift is a __________ process.

Answer 6

Transportation

Question 7

Name the 4 erosion processes.

Answer 7

Hydraulic-action
Abrasion
Attrition
Solution

Question 8

Name one type of chemical weathering?

Answer 8

Carbonation (Acid Rain)

Question 9

What transportation process rolls boulders along the seabed?

Answer 9

Traction

Question 10

Pros + cons to sea wall

Answer 10

-more resilient to the force of the waves as they’re concrete
-promenades so people can walk along them

-can still be broken by powerful waves
-expensive, around £2000 per metre

Question 11

Pros + cons to rock armour

Answer 11

-cheaper than sea wall + east to maintain
-can be used for fishing

-look different to local geology as they are imported from other areas
-expensive to transport

Question 12

Pros + cons to gabions

Answer 12

-cheap (£100 per metre)
-absorbs the wave energy

-not very strong
-looks unnatural

Question 13

Pros + cons to groynes

Answer 13

-builds a beach, encourages tourism, boost local economy
-trap sediment beung carried by longshore drift

-starves beach further down coastline, increasing erosion somewhere
-unnatractive

Question 14

How are spits formed

Answer 14

• sediment carried by longshore drift
• change in shape of coastline, deposition occurs. Long thin ridge deposited
• hooked end can form if there is a change in wind direction
• waves can’t get past spits, water behind spit are sheltered
• salt marshes/mudflats form